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IDProjectCategoryView StatusDate SubmittedLast Update
0001972KdenliveRenderingpublic2011-01-07 16:002011-01-15 10:36
Assigned Toj-b-m 
PlatformOSOS Version
Product VersionRecent git 
Target VersionFixed in Version 
Summary0001972: can't adjust pixel aspect ratio (PAR) for PNG title images
DescriptionMy DV video has 720x576 pixels; kdenlive applies a PAR of 1.066667 to compensate the non-rectangular pixels of a normal television screen, which gives 768x576 pixels on my laptop screen. To avoid distortions, I want to compute title images at 720x576 also – the font rasterizer produces better results if it renders for different X and Y resolutions instead of squeezing the horizontal axis later on.

However, kdenlive apparently doesn't like this approach; it seems that I can't specify a PAR for PNG images.
TagsNo tags attached.
Build/Install MethodManual build from SVN
Attached Files

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-  Notes
j-b-m (administrator)
2011-01-07 23:19

If I am correct, the best way to make it work in Kdenlive / MLT is to make your title images using a 768x576 resolution.

However I agree that being able to modify the aspect ratio of a picture can be useful, I sent a patch on MLT's mailing list to fix that.
lemzwerg (reporter)
2011-01-08 10:55

Thanks. 768x576 works fine, but it isn't exactly what I want.

As soon as your patch is in git, I'll test it.
lemzwerg (reporter)
2011-01-15 10:36

Using kdenlive commit b4b82a1b and mlt commit c2e97113, I can now set the aspect ratio for PNG images. However, it still doesn't work as expected, unfortunately: If I render a project, 720x576 titles scaled with an aspect ratio 4:3 are shifted to the left in the output video.

Note that I'm not happy that I have to set the aspect ratio at all. From a conceptual point of view, it's the wrong action, I believe. I would really like to change the PAR, similar to ordinary DVs.

- Issue History
Date Modified Username Field Change
2011-01-07 16:00 lemzwerg New Issue
2011-01-07 23:19 j-b-m Note Added: 0006304
2011-01-07 23:19 j-b-m Assigned To => j-b-m
2011-01-07 23:19 j-b-m Status new => feedback
2011-01-08 10:55 lemzwerg Note Added: 0006307
2011-01-08 10:55 lemzwerg Status feedback => assigned
2011-01-15 10:36 lemzwerg Note Added: 0006321

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